michael@0: var s = 'abcdFF0123456789012345fail';
michael@0: s = s.replace("abcd", "0123456789012345678901234567890123456789012FF");
michael@0: s = s.replace("FF0123456789012345fail", "ok");
michael@0: assertEq(s, '0123456789012345678901234567890123456789012FFok');